Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 31: Magnetization and Demagnetization Dynamics II
MA 31.7: Vortrag
Mittwoch, 9. März 2016, 11:15–11:30, H34
Ab initio theory for ultrafast spin dynamics on the magnetic Ni3 and Co3+ clusters, also with adsorbed MeOH and EtOH molecules — •Georgios Lefkidis1, Debapriya Chaudhuri1, Wei Jin2, and Wolfgang Hübner1 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Germany — 2School of Physics and Information Technology, Shaanxi Normal University, Xi’an, China
We present a systematic study of the laser-induced, ultrafast spin dynamics on the magnetic trimers Ni3 and Co3+. We investigate the clusters both bare and with MeOH and EtOH adsorbed, which induce spin-density localization. The quality of our high-level, correlational quantum-chemistry calculations is assessed by comparing with experimental IR and electronic spectra [1,2].
By employing optical Λ processes [3] we achieve coherent manipulation of the well localized spins on the trimers, giving rise to a cyclic-SHIFT-register magnetic-logic element. Analyzing the different contributions to the total angular momentum during the processes we also perform calculations including the rotational normal modes of the trimers. Finally we calculate the Kerr effect and the tolerance of the mechanisms with respect to the laser pulse parameters.
- [1] W. Jin, M. Becherer, D. Bellaire, G. Lefkidis, M. Gerhards, and W. Hübner, PRB 89, 144409 (2014)
- [2] D. Chaudhuri, W. Jin, G. Lefkidis, and W. Hübner, JCP 143, 174303 (2015)
- [3] G. Lefkidis, G. P. Zhang, and W. Hübner, PRL 103, 217401 (2009)